Mixing control of fuel jets using synthetic jet technology - Velocity field measurements

Davis, Stan C.; Glezer, Ari

doi:10.2514/6.1999-447

Cited by 35 publications

(23 citation statements)

References 9 publications

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“…The actuators generate unsteady fluctuations and mean jet flows, so they can agitate the fluid mixing. Davis and Glezer (4) showed that synthetic jet actuators enhance the mixing in a circular jet. They employed nine arc actuators around a jet nozzle to agitate azimuthal instability of axisymmetric shear layers.…”

Section: Introductionmentioning

confidence: 99%

Agitated Turbulent Flowfield of A Circular Jet with An Annular Synthetic Jet Actuator

Koso

Kinoshita

2008

JFST

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An agitated circular turbulent jet with a coaxial annular synthetic jet actuator is investigated experimentally. The mean and turbulent velocities are measured by a hot-wire anemometer at a jet Reynolds number of 6400. The measured iso-velocity contour maps indicate that the width of the circular jet is increased even when the intensity of the alternating flow is too weak to generate a synthetic jet. This can be attributed to the periodic disturbances by the actuator, which agitates the instability in the initial shear layer and displaces the shear layer growth upstream. With a strong agitation so as to generate a strong synthetic jet by itself, the agitated jet has the higher velocity and the larger width than those of unagitated jet. With this agitation, the momentum of the agitated jet is increased and its increment is equal to the momentum of the synthetic jet. Smoke visualization shows clearly that the actuator enhances the dispersion of primary jet fluids. These results are compared with those of a jet at a low Reynolds number of 3100 and it is found that the mixing enhancement is qualitatively same for both Reynolds numbers, but the weak agitation is more effective in the low Reynolds number jet.

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Section: Introductionmentioning

confidence: 99%

Agitated Turbulent Flowfield of A Circular Jet with An Annular Synthetic Jet Actuator

Koso

Kinoshita

2008

JFST

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“…Synthetic jets have attracted much attention in recent years because of their potential for flow separation control (Glezer and Amitay, 2002;Gilarranz and Rediniotis, 2001), flow vectoring (Smith and Glezer, 2002) and mixing enhancement (Davis and Glezer, 1999;Koso, 2005;. A synthetic jet is an outward flow produced by an oscillatory flow with a zero-mean velocity through an orifice.…”

Section: Introductionmentioning

confidence: 99%

Effects of stroke and Reynolds number on characteristics of circular synthetic jets

Koso¹,

Morita

2014

JFST

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The circular jet flows generated by a piezoelectric disk were studied experimentally. The velocity distributions were measured using a single hot-wire anemometer, and the effects of the oscillatory flow conditions though a circular orifice were examined. The effects of the dimensionless stroke and Reynolds number of the oscillatory flow on the synthetic jet flows were examined. The stroke was the length of the fluid ejected in an oscillatory cycle and non-dimensionalised by the orifice diameter. The mean velocity distributions were examined for a dimensionless stroke range of 0.60-2.40 with a constant Reynolds number (Re) of 2700. The stroke was found to have a remarkable effect on the streamwise variation in the jet centerline velocity and jet width. As the stroke was increased, the starting point of the jet growth was shifted downstream. This change is discussed by examining the instantaneous velocity signals and attributes in relation to the change in the collapse of vortex rings emitted from the orifice. The momentum of the synthetic jet increased sharply above a critical stroke for the jet formation, and seemed to be saturated for strokes longer than the orifice diameter. The flow field was also examined for a Re range of 1900-3000 with a constant dimensionless stroke of 1.02. In the Re range studied, no significant changes in the jet flows were observed.

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“…Chen et al [4] and Davis and Glezer [6] have presented the mixing enhancement for the active control of separation and turbulence in the boundary layer (see also Smith and Glezer [15], and Crook et al [5]). Mittal et al [12] studied the performance of a synthetic jet actuator, based on a number of geometrical, structural and flow parameters.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of a Synthetic Jet with OpenFOAM

Liu

Kazakidi

Medeiros

et al. 2015

Fluid Mechanics and Its Applications

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Numerical simulations of flow surrounding a synthetic jet actuating device are presented. By modifying a dynamic mesh technique available in OpenFOAM,a well-documented open-source solver for fluid dynamics, detailed computations of the sinusoidal motion of the synthetic jet diaphragm were possible. Numerical solutions were obtained by solving the two dimensional incompressible viscous N-S equations, with the use of a second order implicit time marching scheme and a central finite volume method for spatial discretization in both streamwise and crossflow directions. A systematic parameter study is reported here, in which the external Reynolds number, the diaphragm amplitude and frequency, and the slot dimensions are varied.

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Mixing control of fuel jets using synthetic jet technology - Velocity field measurements

Cited by 35 publications

References 9 publications

Agitated Turbulent Flowfield of A Circular Jet with An Annular Synthetic Jet Actuator

Agitated Turbulent Flowfield of A Circular Jet with An Annular Synthetic Jet Actuator

Effects of stroke and Reynolds number on characteristics of circular synthetic jets

Numerical Simulation of a Synthetic Jet with OpenFOAM

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